Data points: 85
Model compare
GPT-4 Turbo vs GPT-5.1
The readout for GPT-4 Turbo and GPT-5.1, before the detailed comparison sheet.
Key Takeaways
Weighted outcome: GPT-5.1. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
Decision read
GPT-5.1
GPT-5.1 has the higher weighted result; Model A / B score 24 to 76.
Evidence depth
85 data points
Includes 10 benchmark rows, 0 audit samples, and 10 provider examples.
Selection signal
Start with GPT-5.1
The charts below split 20 high-signal samples across speed, scores, and audit health.
Change comparison
Switch either side of this report to compare another model with the same LMSpeed data pipeline.
Select a different model to open a new comparison URL.
Comparison sheet
This report only uses LMSpeed data for GPT-4 Turbo and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
| Model compare | GPT-4 Turbo | GPT-5.1 |
|---|---|---|
| Overall leader | Contender | Leading |
| Weighted overall score | 24.0 pts | 76.0 pts |
| Benchmark category leads | 1 categories | 3 categories |
| Operational advantages | First-token latency | Cheapest input price, Average speed, Free providers, Provider coverage |
| Context window | 128K tokens | 400K tokens |
| Max output | 4.1K tokens | 128K tokens |
| Modalities | Input TextImage Output Text | Input ImageTextFile Output Text |
| Features | Text inputImage inputText outputTool callingStructured outputsJSON mode | Text inputImage inputFile inputText outputTool callingStructured outputsJSON modeReasoning |
The overall result weights benchmark capability categories at 80% and price, API speed/latency, and availability at 20%. Recent test volume does not affect the winner, and missing benchmark categories are excluded.
Model metadata
Model metadata
| Model compare | GPT-4 Turbo | GPT-5.1 |
|---|---|---|
| Developer | OpenAI | OpenAI |
| Released | Apr 2024 | Nov 2025 |
| Parameters | No data | No data |
| Tokenizer | GPT | GPT |
| Knowledge cutoff | 2023-12-31 | No data |
| OpenRouter ID | openai/gpt-4-turbo | openai/gpt-5.1 |
| References | No data | No data |
When to choose each model
This report only uses LMSpeed data for GPT-4 Turbo and GPT-5.1: pricing, speed aggregates, third-party benchmark scores, and shared provider samples.
GPT-4 Turbo
GPT-4 Turbo is stronger in benchmark categories (Knowledge) and operational dimensions (First-token latency).
GPT-5.1
GPT-5.1 is stronger in benchmark categories (Coding, Reasoning, Math) and operational dimensions (Cheapest input price, Average speed, Free providers, Provider coverage).
Benchmark score comparison
Third-party benchmark profile synced into LMSpeed; only metrics available for both models are shown.
Category performance
Compare benchmark category scores on a 0-100 scale. Select a category to inspect the gap.
- Model A coverage
- 4 / 8
- Model B coverage
- 7 / 8
- Shared
- 4 shared categories
Avg. score
GPT-4 Turbo
45.9
Avg. score
GPT-5.1
51.2
Agents
GPT-5.1
Coding
GPT-5.1 leads by 8.4
Reasoning
GPT-5.1 leads by 10.6
Knowledge
GPT-4 Turbo leads by 1.7
Math
GPT-5.1 leads by 7.6
Multilingual
No data
Multimodal
GPT-5.1
Instruction following
GPT-5.1
Professional benchmark details
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
Professional benchmark details
Metric-level scores with benchmark source, rank depth, confidence, error, and evaluation date where available.
GPT-4 Turbo
$10.00/M
Rank #174/185 · confidence 4
GPT-5.1
winner$1.25/M
Rank #122/185 · confidence 4
GPT-4 Turbo
$15.00/M
Rank #174/185 · confidence 4
GPT-5.1
winner$3.44/M
Rank #138/185 · confidence 4
GPT-4 Turbo
$30.00/M
Rank #173/185 · confidence 4
GPT-5.1
winner$10.00/M
Rank #141/185 · confidence 4
GPT-4 Turbo
3.1%
Rank #205/214 · confidence 4
GPT-5.1
winner28.5%
Rank #60/214 · confidence 4
GPT-4 Turbo
69.4%
Rank #103/129 · confidence 4
GPT-5.1
winner80.1%
Rank #62/129 · confidence 4
GPT-4 Turbo
29.1%
Rank #91/115 · confidence 4
GPT-5.1
winner86.8%
Rank #4/115 · confidence 4
GPT-4 Turbo
21.5
Rank #67/75 · confidence 1 · eval date 2023-11-06
GPT-5.1
winner49.4
Rank #47/75 · confidence 3 · eval date 2025-11-13
GPT-4 Turbo
31.9
Rank #100/113 · confidence 1 · eval date 2023-11-06
GPT-5.1
winner43.3
Rank #60/113 · confidence 3 · eval date 2025-11-13
GPT-4 Turbo
3.1
Rank #111/114 · confidence 1 · eval date 2023-11-06
GPT-5.1
winner28.5
Rank #53/114 · confidence 3 · eval date 2025-11-13
GPT-4 Turbo
7.7
Rank #113/117 · confidence 1 · eval date 2023-11-06
GPT-5.1
winner37.5
Rank #58/117 · confidence 3 · eval date 2025-11-13
API audit comparison
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
API audit comparison
Latest completed audits from shared providers, with four safety and integrity score groups plus report links.
| Provider | GPT-4 Turbo | GPT-5.1 |
|---|---|---|
| No completed audits are available from shared providers yet. | ||
Provider examples
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
Provider examples
Speed aggregates and input/output pricing share each provider row for real API selection and migration cost checks.
| Provider | GPT-4 Turbo | GPT-5.1 |
|---|---|---|
BUZZ10 tests | GPT-4 Turbo speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency 137 tok/s / 3299ms input / output No data |
N1N5 tests | GPT-4 Turbo speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency 96 tok/s / 1862ms input / output No data |
小水管 API5 tests | GPT-4 Turbo speed / latency 73 tok/s / 1218ms input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
42公益站0 tests | GPT-4 Turbo speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
AAAI0 tests | GPT-4 Turbo speed / latency N/A / N/A input / output No data | GPT-5.1 speed / latency N/A / N/A input / output No data |
GPT-4 Turbo gpt-4-turbo speed / latency No data input / output $0/request | GPT-5.1 gpt-5.1-chat-latest speed / latency No data input / output $0/request | |
GPT-4 Turbo gpt-4-turbo-preview speed / latency No data input / output $1.37/M/$4.11/M | GPT-5.1 gpt-5.1 speed / latency No data input / output $0.0027/request | |
GPT-4 Turbo gpt-4-turbo-preview speed / latency No data input / output $0.685/M/$2.05/M | GPT-5.1 gpt-5.1 speed / latency No data input / output $0.0068/request | |
GPT-4 Turbo gpt-4-turbo-2024-04-09 speed / latency No data input / output $0.240/M/$0.719/M | GPT-5.1 gpt-5.1-chat-latest speed / latency No data input / output $0.030/M/$0.240/M | |
GPT-4 Turbo gpt-4-turbo speed / latency No data input / output $0.240/M/$0.719/M | GPT-5.1 gpt-5.1 speed / latency No data input / output $0.030/M/$0.240/M |
FAQ
Weighted outcome: GPT-5.1. Benchmark capability categories carry 80%, while price, API performance, and availability carry 20%.
- Why is this comparison indexable?
- It has 6 verifiable comparison points, and both models have pricing or benchmark data.
- Are missing metrics invented?
- No. Metrics without LMSpeed data are omitted from this report.